| 초록 |
UV- light activated TiO2 thin film for H2S sensing at room temperature is reported. TiO2 thin films are fabricated by bar coating of a mixture of TiO2 powder and acetic acid. The morphology and structural properties were examined by scanning electron microscopy, X-ray diffraction, photoluminescence spectroscopy, absorption spectroscopy, and X-ray photoelectron spectroscopy. The UV irradiation significantly enhanced the H2S response signals and response/recovery kinetics. The sensor also showed high selectivity for H2S. The effects of UV light intensities and humidity on the sensing performance was also investigated. The results exhibited simple way of detecting parts per million concentrations of H2S at room temperature. The possible mechanism of photoconduction sensing for detecting H2S is also discussed. |
